Patent application number | Description | Published |
20090001725 | Method for operation of a converter system - The present invention relates to a method for operating a converter system of a wind turbine, wherein the converter system includes converter modules capable of converting electric power produced by a generator to electric power applicable to a utility grid. The converter modules include generator inverters and grid inverters. The method determines the enabling/disabling of the converter modules in response to a parameter related to the variable amount of electric power being produced by the generator. Advantages of the present invention are optimisation of power efficiency of the converter modules and improved reliability of the converter modules. Another advantage is the capability of fast enabling and disabling of the converter modules. | 01-01-2009 |
20090021013 | WIND POWER SYSTEM AND METHOD OF OPERATING IT - The wind power system comprises an installation ( | 01-22-2009 |
20130026756 | METHOD AND ARRANGEMENT FOR OPERATING A WIND FARM WITHIN VOLTAGE LIMIT - A method for determining a limit value of a wind turbine reference operational variable is described The wind turbine being connected to a connection node to which a utility grid is connected. The method includes: obtaining a first input signal indicative of a connection node limit voltage; obtaining a second input signal indicative of a connection node voltage; and determining the limit value of the wind turbine reference operational variable based on the first signal and the second signal. Further a corresponding arrangement is described. | 01-31-2013 |
20130038059 | ARRANGEMENT FOR GENERATING A CONTROL SIGNAL FOR CONTROLLING AN ACCELERATION OF A GENERATOR - An arrangement is provided for controlling a power output of a power generation system by controlling an acceleration of a generator of a power generation system. The arrangement includes an input terminal for receiving an input signal indicative of an actual grid frequency of a utility grid, a control circuit for generating a control signal, and an output terminal to which the control signal is supplied. The control circuit is adapted for receiving the input signal, for determining whether the actual grid frequency is above a predefined threshold, and, if the input signal indicates that the actual grid frequency is above the predefined threshold, for generating the control signal based on the input signal. The control signal is indicative of an acceleration of the generator. The power output of the power generation system is controlled by controlling the acceleration of the generator. Further a power generation system is described. | 02-14-2013 |
20130131879 | ARRANGEMENT FOR GENERATING A CONTROL SIGNAL FOR CONTROLLING A POWER OUTPUT OF A POWER GENERATION SYSTEM - An arrangement for generating a control signal for controlling a power output of a power generation system is described. The power output is to be supplied to a utility grid, the arrangement includes an input terminal for receiving an input signal indicative of an actual grid frequency of the utility grid; a control circuit for generating the control signal wherein the control circuit comprises a first circuit for generating a time derivative value of the input signal; and an output terminal to which the control signal is supplied, wherein the control signal depends on the generated time derivative value of the input signal. Further a power generation system is described. | 05-23-2013 |
20130193933 | METHOD AND ARRANGEMENT FOR OPERATING A WIND TURBINE CONVERTER - A method of operating a converter of a wind turbine for providing electric energy to a utility grid includes determining a grid voltage. If the grid voltage is between a nominal voltage and a first voltage threshold, i.e. higher than the nominal voltage, a normal procedure for lowering the grid voltage is performed. If the grid voltage is above the first voltage threshold, another procedure for keeping the wind turbine connected is performed, wherein the other procedure is different from the normal procedure. Further a corresponding arrangement is described. | 08-01-2013 |
20130200621 | METHOD AND ARRANGEMENT FOR CONTROLLING A WIND TURBINE USING OSCILLATION DETECTION - A method for controlling a wind turbine is provided. The method includes monitoring an electrical quantity at an output terminal of the wind turbine. The electric quantity has an amplitude and periodically varying with a grid frequency. The method further includes detecting an oscillation of the amplitude and decreasing active power output from the wind turbine at the output terminal depending on the detected oscillation. | 08-08-2013 |
20140152292 | DECOMPOSITION AND MITIGATION OF A DISTURBANCE BEING PRESENT AT AN ELECTRIC CONNECTION BETWEEN AN ELECTRIC POWER GENERATING SYSTEM AND A POWER GRID - A disturbance on an electric signal at an electric connection between an electric power generating system and a power grid is decomposed into a first disturbance with a first strength assigned to the electric power generating system and a second disturbance with a second strength assigned to the power grid. A voltage value of a voltage of the electric signal is measured. A current value of a current of the electric signal is measured. A value of an open circuit voltage of an equivalent voltage source is calculated based on the measured voltage value, the measured current value and a characteristic equivalent impedance of the electric power generating system so that the electric power generating system is in a harmonic model. The strength of the first disturbance is determined based on the calculated value of the open circuit voltage of the equivalent voltage source. | 06-05-2014 |
20140361537 | POWER OSCILLATION DAMPING BY A CONVERTER-BASED POWER GENERATION DEVICE - A power generation park is provided including a power output for providing electrical output power to an electricity network. A power generation device includes a converter device configured for receiving input power from a power generator and providing, in response hereto, the electrical output power to the power output. The power generation park further includes a controller configured for receiving an oscillation indicating signal indicative of a power oscillation in the electricity network, the controller further configured for providing a damping control signal in response to the oscillation indicating signal, the converter device configured for modulating the electrical output power in response to the damping control signal so as to damp the power oscillation in the electricity network. | 12-11-2014 |
20150014992 | OPERATING WIND TURBINES AS DAMPING LOADS - A control device, method, and computer program for a wind park are provided, the wind park having a plurality of wind turbines for generating electric power, wherein the wind turbines are electrically interconnected by a wind park grid. The control device includes (a) a determining unit for determining whether a wind park load for consuming electric power from the wind park grid is to be enabled, (b) a calculating unit for calculating a power reference value for each of the plurality of wind turbines, the power reference value being indicative of the amount of power which the corresponding wind turbine should produce, and (c) a transmitting unit for transmitting the calculated power reference values to the corresponding wind turbines, wherein, if the determining unit has determined that the wind park load is to be enabled, at least one of the power reference values calculated by the processing unit is negative. | 01-15-2015 |
20150025860 | METHOD AND DEVICE FOR ESTIMATING GRID PROPERTIES OF A POWER GRID - A method for estimating grid properties of a power grid coupled to a generator at a point of common coupling is provided. First, a voltage V | 01-22-2015 |